CGRG Bibliography of Canadian Geomorphology
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Author : Davidson-Arnott, R.G.D.; Ollerhead, J.; Walker, I.J.; and Hesp, P.A.
Date : 2003.
Title : Spatial and temporal variability in intensity of aeolian transport on a beach and foredune.
Publication : Proceedings of Coastal Sediments ’03 - Crossing Disciplinary Boundaries, May 18-23, 2003, Sheraton Sand Key Resort - Clearwater Beach, Florida.
Issue :
Page(s) :
Abstract
This paper presents results from measurements of the intensity of sand transport by wind on the beach and stoss slope of a vegetated foredune over one day, at Greenwich Dunes, Prince Edward Island, Canada. Measurements of wind speed and direction were made with arrays of cup anemometers and 2-D sonic anemometers. Sediment transport intensity was measured at a height of 2- 4 cm above the bed using 6 Sabatech omnidirectional saltation probes which count the impact of saltating grains on a piezoelectric crystal. Individual sensors appear to provide a consistent response to fluctuating sand transport. Where there is a considerable supply of dry sand the saltation system responds very rapidly (1-2 seconds) to fluctuations in wind speed - i.e. to wind gusts. Where sand supply from the surface is limited by moisture or by the presence of vegetation, mean transport rates are much lower and this reflects both a reduction in the instantaneous transport rate and in a transport system that becomes increasingly intermittent. While at this stage the saltation probes cannot provide a reliable estimate of the total sediment flux, they do provide a useful insight into the nature of the transport system and thus compliment measurements of sediment flux made with integrating sand traps.
Bibliography of Canadian Geomorphology